Print forces at the end of the minimization and the Wyckoff gradient even if minim_struct is false

[mesonepigreco]

Print the forces at the end of the minimization to have physical information.
Also, it would be good to print the Wyckoff gradient even if minim_struct is false, in order to have hint whether the structure needs to be minimized.

[mesonepigreco]

Solved in the #61